Lifting-jack.



No. 730,329. PATENTED JUNEWQ, 1903.

I T. WRIGHT.

LIPTING JACK.

, APPLICATION rum) SEPT. 16. 1902.

no MODEL. 2 snzn'rs samr 1.

WITNESSES: 0" [NVEym/e- Wf$ v v W0 f B W Z rm: ncm'us PETERS cu.whom-urn), wlsumm'un u c Arm-730,329. a I PATENTED JUNE 9,1903,

T." WRIGHT.

LIPI'INGJAOK.

APPLICATION FILED SEPT. 16. 1902. 1m MODEL. I 2 SHEETS-SHEET 2.

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Wlnvgs s [NI gyro)? UNITED STATES Patented dune 9, 1903.

PATENT OFFICE.

LlFTlNG-JACK.

SPECIFICATION forming'part of Letters Patent No. 730,329, dated June 9,1903.

Application filed September 16, 1902. $eria1 No. 123,650. No model.) a

1'0 tall whom it may concern.-

Be it known that I, THOMAS WRIGHT, a citizen of the United States,residing at Ensley, in the county of Jefierson and State of Alabama,have invented certain new and useful Improvements in Lifting-Jacks; andI do declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a partof thisspecification.

This invention relates to new and useful improvements in lifting-jacks,and essentially to the provision of means whereby heavy loads or weightsmay be raised by the manipulation of hoisting meansTand also intheprovision of apparatus whereby the standards supporting the weightmay be moved horizontally by means of a second j ack-screw.

The invention consists, further, in various details of construction andin combinations of parts, as will be hereinafter fully described andthen specifically defined in the appended claims.

My invention 'is clearly'illustrated in the accompanying drawings,which, with the letters of reference marked thereon, form a part of thisapplication, and in which drawings Figure 1 is a side elevation of myimproved lifting-jack. Fig. 2 is a central vertical sectional view. Fig.3 is a detail view showing the parts detached. Fig. 4 is a rearelevation of the jack.

Reference now being had to the details of the drawings by letter, Adesignates a rectangular frame made out of any suitable material, andmounted in the" end wall of said frame is a screw B, one end of which issquared to receive an operating-lever. Said screw passes through a block0, which iscentrally apertured and provided with interior threads, whichare engaged by the threads of said screw. A plate D, which rests on saidframe, is centrally apertured and. swiveled on the lug C, which risesfrom the upper surface of the block 0. A pin F passes through the upperend of said upright portion in order to hold the plate to the blockthrough which the screw passes.

Rising from the plate D is a Housing G,

one face rliereofl'and. projecting rearwardly' from said baris a pin K,which travels in the slot G iusaid housing to serve as a guide as thebar is raised and lowered. Mounted in apertures in the braces N and N,which are mounted one between the walls of the housing and the otherover the upper ends of the side pieces of the housing, is a worm M whichis in mesh with the teeth of said bar H, and the upper end of the pintleof said worm is squared and on which the end of a ratchetoperating levermay be placed to rotate the worm. The upper end of said bar H has acontracted and rounded projection upon which the hollow. shank portionof the shoe R is swiveled and with which the weight to be hoistedcontacts.

From the construction described and as illustrated in the drawings itwill be noted that by the-provision ofa jack-screw embodyinn thefeatures of my invention great power may be exerted by t he operation ofthe ratchetlever,'and when a load is raised it may be movedlongitudinally by operatingzihe horizontallydisposed screw. Ifpreferred, the upright and horizontal portions of the jack maybedetached and used separately from each other, it. being understood thatmy invention contemplates the use of both parts together or singly asone may desire.

Havingthus fully described myinvention, what I claim as new, and desireto secure by Letters Patent, is

1. A jaclcscrew comprising: a horizontallydisposed'fra n1ework,a screwhorizontally disposed in the ends thereof, a block having an aperturewith threaded Walls mounted upon said screw,- and a lifting-jackswiveled on an extended portion of said block, as set forth.

2. The combination, in a lifting-jack, a

\ base portion, a horizontallymounted screw therein, a block having anaperture with interior threads mounted on said screw, a swiv eled platecentrally apertured and mounted upon a contracted end of said block, apin .passing through said contracted portion to hold the swiveled platein place, and a lifting-jack mounted upon said swiveled plate, as setforth.

3. A lifting-jack, a base portion, having a horizontally-mounted screwjournaled therein, a block, having an aperture with interior threadsmounted on said screw, a plate swiveled to said block, a housing mountedon said plate, a vertically-movable bar mounted in guideways in saidhousing and having one of its faces threaded, a worm verticallyjournaled within the housing and in mesh with the threads of said bar,and a shoe on the upper end of said bar, as set forth.

4. A lifting-jack having a base portion having a horizontally-mountedscrew, a block, having an aperture with interior threads THOMAS WRIGHT.

Witnesses:

W. A. HUMPHRIES, (J. T. WALKER.

